mirror of git://gcc.gnu.org/git/gcc.git
34 lines
998 B
Fortran
34 lines
998 B
Fortran
C******************************************************************************
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C FILE: omp_reduction.f
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C DESCRIPTION:
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C OpenMP Example - Combined Parallel Loop Reduction - Fortran Version
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C This example demonstrates a sum reduction within a combined parallel loop
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C construct. Notice that default data element scoping is assumed - there
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C are no clauses specifying shared or private variables. OpenMP will
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C automatically make loop index variables private within team threads, and
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C global variables shared.
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C AUTHOR: Blaise Barney 5/99
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C LAST REVISED:
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C******************************************************************************
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PROGRAM REDUCTION
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INTEGER I, N
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REAL A(100), B(100), SUM
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! Some initializations
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N = 100
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DO I = 1, N
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A(I) = I *1.0
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B(I) = A(I)
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ENDDO
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SUM = 0.0
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!$OMP PARALLEL DO REDUCTION(+:SUM)
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DO I = 1, N
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SUM = SUM + (A(I) * B(I))
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ENDDO
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PRINT *, ' Sum = ', SUM
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END
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